What are bottlenecks of concurrent channel capacity of system ?

The concurrent channel capacity of system can be limited by following factors

a. Server Hardware , A dual core 3.0 GHZ system can support more than 500 concurrent channels

b. Voip Provider / Gateway does limit number of concurrent channels

c. Internet Bandwidth and codec selection can limit number of concurrent channels , g.729 use more processing power while g.711 uses more bandwidth resources

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